Charles maschmeyer



(No Model.)

0. MASOHMEYER.

EXTENSION LAMP SUPPORT.

No. 430,392. Patented June 17,1890."

- fiWM ,2 w :1 f I/ UNITED STATES PATENT OFFICE.

CHARLES MASCHMEYER, OF MERIDEN, CONNECTICUT, ASSIGNOR TO EDIVARD MILLER 8: COMPANY, OF SAME PLACE.

EXTENSION LAM P-SUEPORT.

SPECIFICATION forming part of Letters Patent No. 430,392, dated June 17, 1890.

Application filed March 10, 1890- Serial No. 343,283. (No model.)

To all whom it may concern:

Be it known that I, CHARLES MASOHMEYER, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Extension Lamp-Supports; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, iii- Figure 1, a vertical central section, parts in side View, of so much of the standard as necessary to illustrate the invention; Fig. 2, a transverse section on line 00 0c of Fig. 1, looking upward; Fig. 3, a side view of the lower portion of the inner tube, looking against one face of the wedge, and representing the rollers as resting thereon; Fig. 4, a modification in the construction of the cramping device.

This invention relates to an improvement in that class of adjustable lamp-fixtures especially adapted forstandard lamps, in which the support consists of two tubes telescopically arranged, one stationary and the other adjustable therein, the object of the invention being a simple and effective locking device, whereby the two tubes may be so interlocked as to prevent accidental movement; and it consistsin the construction as hereinafter described, and particularly recited in the claims.

A represents the outer or stationary tube, and B the inner tube, made vertically adj ustable in the said outer tube A in the usual manner.

C represents a jacket, which is arranged around the outer tube as an ornamental cover therefor, also in the usual manner. At its inner end the tube B is constructed with a wedge D, this wedge being arranged diametrically across the lower end of the tube, as seen in Fig. 2. Vertically through the tube B a rod E is arranged, which carries at its upper end ahandle F, extending laterally outward through an opening Gr in the said tube B, and by means of which vertical movement may be imparted to the said rod. \Vithin the tube B a spring II is arranged, its lower end resting upon a shoulder I in the inner tube,

and its upper end bearing against the hub of the handle F of the rod, the tendency of this spring being to hold the rod. in its up position. At its lower end the rod carries a crosshead J, extending through a transverse slot in the said wedge I), this cross-head occupying a central diametrical position, as seen in Fig. 2, at right angles to the plane of the faces of the wedge D. The cross-head at each side the respective faces of the wedge D is constructed with an elongated bearing K to receive the axle L of a pair of rollers M M, there being one pair of such rollers arranged in the crosshead each side the wedge D, as seen in Figs. 1 and 2. These rollers are of a diameter greater than the least distance between the respective faces of the wedge D and the corresponding or opposing inner surface of the tube A, as seen in Fig. 2, and so that when drawn ontothe said faces of the wedge D they will come to a bearing and form a cramp between the said faoes and the opposing surface of the tube A, and thus form a cramp between the inner and outer tube, which will prevent the descent of the tube B beyond the point where the said rollers come to a hearing between the said wedge and the outer tube. The rod E permits amechanicalmovement of the cross-head, and so that by the application of the thumb to the handle F and the downward pressure thereon the crosshead with the rollers may be forced downward, as seenin broken lines, Fig. 1, to force the rollers toward the thinner portion of the wedge, and thereby take them out of the cramping position, and in this position the tube B is free to be moved up or down to the desired position, and that position being attained the rod is left free, when the reaction of the spring II will draw the cross-head, with its rollers, upward again into the cramped position. In this position the natural tendency of the tube B to descend increases the cramping force between the two tubes; but when the rollers are forced from their cramping position the adjustable portion is free to be moved to any desired point, and because the upward movement of the tube B will tend to draw the wedge D from between the rollers it relieves the rollers from the force of the wedge to such an extent that the tube B may be drawn upward without necessarily forcing the rod downward, yet it is better'to force the rollers from their cramped position in both directions of movement of the tube B.

Instead of making the cross-head rigid, as I have described, it may be made in the form of two arms J J, hinged to the rod E above, as seen in Fig. 4, and each carrying acramp, as M, made fast to the lower end of said arms, and so that these cramps will be drawn onto the wedge in like manner as described for the rollers M in the first illustration. In this modification the cramps are represented as a stationary part of the arms. I, however, prefer the construction first described.

While the invention is especially adapted for the class of lamps commonly called standard lamps, it will be understood that it may be applied to other classes of lamp-supports in which telescopic rods are employed.

For the handle H any of the known substitutes for operating the rod may be employed.

I claim- 1. In an extension-support for lamps, consisting of two tubes, one adj ustably arranged within the other, the inner tube constructed with awedge D. diametrically across its inner end, a rod E within said inner tube and extending toward said wedge, a pair of cramps in connection with said rod, said cramps be- 1ng arranged to bear one upon each of the inclined surfaces of the said wedge, and so as to form cramps between the said inclined surfaces and the corresponding opposing surfaces of the outer tube, and a spring adapted to force the said cramps onto said inclined sur faces of the wedge, the said rod extending to a point outside said outer tube and there provided with a suitable handle by which the said rod may be operated, substantially as described.

2. The combination of the outer tube A, the tube B, vertically adjustable therein, a Wedge D, diametrically across the inner end of said tube B,a rod E,vertically adjustable in said inner tube,its lower end extending to said wedge, a cross-head J, attached to the lowerend of said rod and at right angles to the respective faces of said wedge D,the cross-head constructed with elongated seats at each side said wedge, and rollers on each side of said wedge, the axis of said rollers in said elongated seats of the said cross-head, the said rollers adapted to cramp between said inclined surfaces of the wedge and the opposing surfaces of the outer tube with a spring, the tendencyof which 7,

is to draw the said rollers onto the said inclined surface of the wedge, substantially as described.'

GEO. L. I-IooPER, GEO. M. CHITTENDEN. 

